User blog comment:L1842947/Female Protean Froakie with Toxic Spikes/@comment-31261774-20170208222728

Okay, I tested it, and the Move Relearner can't teach egg moves to mons that forgot them. That means I'll lose Toxic Spikes on the Froakie if I try to breed it. Maybe this isn't a problem for teaching Toxic Spikes to other offspring if the male knows Toxic Spikes, but I still don't know if hidden abilities have a fair chance of being passed down or not.